diff --git a/build/pkgs/sage_conf/src/pyproject.toml b/build/pkgs/sage_conf/src/pyproject.toml
index 9d2faa86cf0..5a9133a4850 100644
--- a/build/pkgs/sage_conf/src/pyproject.toml
+++ b/build/pkgs/sage_conf/src/pyproject.toml
@@ -13,3 +13,6 @@ description-file = "README.rst"
 [tool.flit.scripts]
 #sage-env-config = "bin/sage-env-config"
 sage-config = "sage_conf:_main"
+
+[tool.flit.sdist]
+include = ["sage_conf.py"]